| Acronym | Meaning |
| AST | Aboveground Storage Tank |
| FFFSG | Fossil Fuel Fired Steam Generator |
| WBEPM | Weakest Bound Electron Potential Model (theory In Calcns. Of Ionization Potentials) |
| DPSS | Diode-pumped Solid-state |
| VSWIR | Very Short Wavelength IR |
| GFCS | Gas Filter Correlation Spectroscopy |
| ESA-IRS | European Space Agency-Information Retrieval Service |
| PACIMS | Passive Chem. Ionization Mass Spectrometry |
| TDC | Top Dead Center |
| QPD | Quadrature Phase Detection |